Title:
CIRCUIT BOARD FOR MOUNTING ELECTRONIC PARTS
Document Type and Number:
WIPO Patent Application WO/1998/011605
Kind Code:
A1
Abstract:
A circuit board for mounting electronic parts, which includes first connecting terminal groups (12A and 12B) composed of a plurality of connecting terminals densely formed on the front surface (S1) of a base substrate (2) having through holes (6) and a second connecting terminal group (13) composed of a plurality of connecting terminals formed in at least outer peripheral section on the rear surface (S2) of the substrate (2). The first groups (12A and 12B) are connected to the second group (13) through the holes (6). On the front surface of the substrate (2), build-up multilayered wiring layers (B1 and B2) having via holes (11) are formed and the first groups (12A and 12B) are connected to the second group (13) through the wiring layers (B1 and B2) and through holes (6). In another example, each signal line (52) on the surfaces of the wiring layers (B1 and B2) is composed of a plurality of wiring patterns (58 and 59) having different line widths and a tapered pattern (60) which connects the wiring patterns (58 and 59) to each other and the width of which continuously varies. The line width of the signal line (52) in an area where the wiring density is relatively high is made narrower than that in another area where the wiring density is relatively low.
Inventors:
ASAI MOTOO (JP)
KAWAMURA YOICHIRO (JP)
MORI YOJI (JP)
KAWAMURA YOICHIRO (JP)
MORI YOJI (JP)
Application Number:
PCT/JP1996/002608
Publication Date:
March 19, 1998
Filing Date:
September 12, 1996
Export Citation:
Assignee:
IBIDEN CO LTD (JP)
ASAI MOTOO (JP)
KAWAMURA YOICHIRO (JP)
MORI YOJI (JP)
ASAI MOTOO (JP)
KAWAMURA YOICHIRO (JP)
MORI YOJI (JP)
International Classes:
H05K3/46; H01L23/498; H01L23/538; H05K1/02; H05K1/11; H05K3/18; (IPC1-7): H01L23/12; H05K1/03
Foreign References:
| JPS56114361A | 1981-09-08 | |||
| JPH06112355A | 1994-04-22 | |||
| JPH05327224A | 1993-12-10 | |||
| JPH03222348A | 1991-10-01 | |||
| JPH05235199A | 1993-09-10 | |||
| JPH07249627A | 1995-09-26 | |||
| JPS63257306A | 1988-10-25 | |||
| JPH0850353A | 1996-02-20 | |||
| JPH0892332A | 1996-04-09 |
Other References:
See also references of EP 0883173A4
Attorney, Agent or Firm:
Onda, Hironori (Ohmiya-cho 2-chome Gifu-shi, Gifu-ken 500, JP)
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